文章摘要
徐海岩,李涛,李海波,王鑫林,张洪潮.激光熔覆成形薄壁件离焦量和Z轴提升量选择方法[J].,2017,57(6):557-563
激光熔覆成形薄壁件离焦量和Z轴提升量选择方法
Method to select defocused amount andZ-increments in forming thin-walled part with laser cladding
  
DOI:10.7511/dllgxb201706002
中文关键词: 激光技术  薄壁件成形  离焦量  Z轴提升量
英文关键词: laser technology  thin-walled parts forming  defocused amount  Z-increments
基金项目:国家自然科学基金资助项目(51775086).
作者单位
徐海岩,李涛,李海波,王鑫林,张洪潮  
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中文摘要:
      离焦量和Z轴提升量影响激光熔覆成形薄壁件的精度和效率,得到高精度薄壁件的关键是使Z轴提升量等于初始离焦量下的熔覆高度.为了解决高精度、高效率激光熔覆成形薄壁件问题,基于概率学构建了同轴送粉式激光熔覆系统的粉末分布密度模型,得到了不同负离焦量下熔覆高度计算公式并进行实验验证.提出了任意负离焦量和Z轴提升量下多层熔覆成形薄壁件高度的计算方法并进行实验验证.结果表明多层熔覆成形薄壁件高度的计算结果与实验结果基本一致,选择尽可能大并且能够形成自愈合作用的负离焦量,并使Z轴提升量等于该离焦量对应的熔覆高度计算值,可以得到成形效率高、精度高的薄壁件.
英文摘要:
      Defocused amount and Z-increments affect the accuracy and efficiency of thin-walled part with laser cladding forming. The key to obtain high-accuracy thin-walled part is to make the Z-increments equal the cladding height under initial defocused amount. In order to solve the problem of forming thin-walled part with high accuracy and efficiency, powder density distribution model of laser cladding system with coaxial-powder feeding is established based on the probability theory, the calculation formula of cladding height under different negative defocused amounts is given and experimentally verified. The calculation method of multi-layer cladding forming thin-walled part height under any negative defocused amount and Z-increment is proposed and experimentally verified. The results show that calculations of multi-layer cladding forming thin-walled part height are in accordance with experiments. Selecting self-regulation-effect negative defocused amount as large as possible, and making Z-increments equal the calculated value of cladding height under this defocused amount, the thin-walled parts with high forming efficiency and high accuracy can be obtained.
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